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Observed and simulated variability of the North Atlantic subpolar gyre
Helge Drange & CoG. C. Rieber Climate Institute, the Nansen Center, Bergen, Norway Bjerknes Centre for Climate Research, Bergen, Norway
Geophysical Institute, University of Bergen, Norway Nansen-Zhu International
Research Centre, Beijing, China
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NOClim-cite
d:
Curry & Mauritz
en (2005); H
atun et al. (
2005)
NOClim-re
levant:
Orvik and Skagseth (2005); M
auritzen et a
l. (2006);
Siegismund et al. (
2006)
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Essentially Curry & Mauritz
en, Science, 2005
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~300.000 hydrogrphic profiles (NISE)
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Orv
ik, K
jell
Aril
d; S
kags
eth,
Øys
tein
(20
05),
Hea
t flu
x va
riatio
ns in
the
east
ern
Nor
weg
ian
Atla
ntic
Cur
rent
tow
ard
the
Arc
tic fr
om m
oore
d in
stru
men
ts, 1
995–
2005
. Geo
ph. R
es. L
ett.,
32,
No.
14,
L14
610
10.1
029/
2005
GL0
2348
7
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Orv
ik, K
jell
Aril
d; S
kags
eth,
Øys
tein
(20
05),
Hea
t flu
x va
riatio
ns in
the
east
ern
Nor
weg
ian
Atla
ntic
Cur
rent
tow
ard
the
Arc
tic fr
om m
oore
d in
stru
men
ts, 1
995–
2005
. Geo
ph. R
es. L
ett.,
32,
No.
14,
L14
610
10.1
029/
2005
GL0
2348
7
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Orv
ik, K
jell
Aril
d; S
kags
eth,
Øys
tein
(20
05),
Hea
t flu
x va
riatio
ns in
the
east
ern
Nor
weg
ian
Atla
ntic
Cur
rent
tow
ard
the
Arc
tic fr
om m
oore
d in
stru
men
ts, 1
995–
2005
. Geo
ph. R
es. L
ett.,
32,
No.
14,
L14
610
10.1
029/
2005
GL0
2348
7
“...The extreme temperature increase of 1 oC appears, however, to be independent of the current strength. A future challenge here will be to reveal
the cause of this extraordinary warming...”
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R
I
F
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Altimetry
MICOM
SSH EOF
I
I
F
F
R
R
The subpolar gyre influence
(Häkkinen and Rhines, Science, 2004)
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RI
A longer term perspective
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Observed and simulated salinity anomalies from about 1970 to present
Observed Simulated
Irminger (I) Faroe (F) Rockall (R)
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(inverted)
WNAW
ENAW
Fresh Saline
The gyre shape and the Rockall Trough
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Important: Relationship valid for temperature also!
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EOF1 Wind stress curl (26%) EOF1 Buoyancy flux (19%)
Red: SSH PC1 Black: SLP PC1 Green: PC1 Wind stress Blue: PC1 Buoyancy flux
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Volume of LSW in layers 15 and 16 and the GI
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QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
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QuickTime™ and aTIFF (LZW) decompressor
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The dynamics of the N-Atl subpolar gyre is of key importance for the poleward transport of heat and salt
The dynamics of the N-Atl subpolar gyre is largely governed by winter time bouyancy forcing
Decadal-scale coupled atm-ocean mode possible - needs investigation! (coupled model system required)
Current generation of OGCMs is able to complement observations
NOClim has provided important insight into the variability of the (marine) climate of the N-Atl
Summary: